The Study Of Three-Channel Digital Receiver With High Coherence Of Amplitude And Phrase

The main work of this paPer is the study and the development of three-channeldigital receiver that holds the character of high amplitude and phase coherence andthat can be used by various kinds of the direction-finding systems. My work canimprove the performance and the common-use ability of the digital receiver to a highlevel, and in the meantime can improve the direction-finding precision and responsetime.The first pari of this dissertation is the overall design of three-channel digitalreceiver. In the analysis of the factors that can lead to incoherence between channels,we present a new method utilizing hardware filter to imPlement the high amplitudeand phase coherence. Then we make the detailed design in hardware and software. Inthe design of hardware, considering the response time we choose the DSP chipTMS320C25D to design signal processing board and IMSAl00 to design filter board.And in the design of software, we present a new dependable method that canimplement digital automatic gain control and a new amp1itude and phase calculatingmethod. The sample equipment that we have achieved shows our design meets theneeds of user's demand.